Just addition:
They are involved in some of the more basic things that we do with our senses, in particular, sight and sound. When we see something within our visual field, we can turn our eyes to it. And when we hear something, we can turn our heads toward the sound. These types of more reflexive movements to sensory information are carried out in the corpora quadrigemina. They can be more accurately described as orientation toward sensory information. The superior colliculi are involved in the visual orientation, while the inferior colliculi are more important for auditory orientation.